Method for treating arsenic-containing smoke dust

A treatment method and technology for arsenic soot, applied in the preparation/purification of sulfur, arsenate/arsenite, etc., can solve problems such as high energy consumption, and achieve the effects of eliminating pollution, solving open circuit problems, and having a wide range of raw material sources.

Active Publication Date: 2010-09-01
红河砷业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high-temperature roasting, which consumes a lot of energy

Method used

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  • Method for treating arsenic-containing smoke dust
  • Method for treating arsenic-containing smoke dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Smoke composition: As48.34%; pyrite composition: Fe43.28%, S36.57%, particle size -100 mesh.

[0022] 1.0Kg of arsenic-containing fumes were leached with a sulfuric acid solution with a concentration of 21.74g / L to obtain 11.2L of leaching solution with an arsenic concentration of 41.03g / L. Add 1.19Kg of pyrite powder into the leaching solution and stir for 0.5 hours, then add it into a closed stirring reactor, feed oxygen to the oxygen partial pressure of 1.0Mpa, heat to 130°C, stir for 3 hours, and filter to obtain iron arsenate and element Sulfur mixed solid 2.11Kg, 19.73g / L sulfuric acid solution 10.3L.

[0023] Take 1kg of the mixed solid and heat it to 135°C, press it into a block, cool to room temperature and consolidate to obtain a hydrophobic solid with high strength and harmless to the environment; press 1 kg of the mixed solid into a block, heat it to 135°C and keep it warm for 20 minutes, and cool Consolidate at room temperature to obtain a hydrophobic soli...

Embodiment 2

[0025] Smoke composition: As48.34%; pyrite composition: Fe43.28%, S36.57%, particle size -100 mesh.

[0026] Leach 1.0Kg of arsenic-containing dust and sulfuric acid solution with a concentration of 12.74g / L to obtain 11.4L of leach solution with an arsenic concentration of 38.59g / L. Add 1.52Kg of pyrite powder to the leach solution and stir for 0.5 hours, then add airtight stirring reaction Into the vessel, feed oxygen to the oxygen partial pressure of 1.5Mpa, heat to 100°C, stir for 4 hours, and filter to obtain 10.4L of sulfuric acid solution of 2.53Kg and 11.43g / L mixed solid of iron arsenate and elemental sulfur.

[0027] Take 1kg of the mixed solid, heat it to 150°C, press it into a block, cool to room temperature and consolidate, and obtain a hydrophobic solid with high strength and harmless to the environment; take 1kg of the mixed solid, press it into a block, heat it to 150°C and keep it warm for 10 minutes, and cool Consolidate at room temperature to obtain a hydrop...

Embodiment 3

[0029] Smoke composition: As48.34%; pyrite composition: Fe43.28%, S36.57%, particle size -100 mesh.

[0030] Leach 1.0Kg of arsenic-containing dust and sulfuric acid solution with a concentration of 28.43g / L to obtain 11.2L of leaching solution with an arsenic concentration of 42.3g / L. Add 1.52Kg of pyrite powder to the leaching solution and stir for 0.5 hours, then add airtight stirring reaction Into the vessel, feed oxygen to the oxygen partial pressure of 0.7Mpa, heat to 160°C, stir for 2 hours, and filter to obtain 1.69Kg, 29.57g / L sulfuric acid solution of mixed solid of iron arsenate and elemental sulfur 10.1L.

[0031] Take 1kg of the mixed solid, heat it to 120°C, press it into a block, cool to room temperature and solidify, and obtain a hydrophobic solid with high strength and harmless to the environment; take 1kg of the mixed solid, press it into a block, heat it to 120°C and keep it warm for 30 minutes, and cool Consolidate at room temperature to obtain a hydrophobi...

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Abstract

The invention provides a method for synthesizing ferricarsenate from arsenic-containing smoke dust by leaching, pressure oxidation and conversion, and consolidating the ferricarsenate. The method comprises the following steps of: leaching the arsenic-containing smoke dust by using 10 to 30g/L of dilute sulfuric acid solution; mixing and stirring the smoke dust and powdered pyrite; adding the mixture into a closed stirring reactor; introducing oxygen into the reactor until the oxygen partial pressure is between 0.6 and 1.5MPa; heating the reactor to the temperature of between 100 and 160 DEG C, stirring the mixture to perform reaction for 2 to 4 hours; filtering the reaction product to obtain mixed solid of ferricarsenate and sulphur, and 10 to 30g/L of dilute sulfuric acid solution which is returned and leached; and solidifying the mixed solid to obtain environment-friendly hydrophobic solid with high strength. The method has no emission of waste gas or waste water in the treatment process, can solve the opening problem of arsenic in various arsenic-containing smoke dusts, and eliminates pollution of the arsenic-containing smoke dust to the environment.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy. The invention relates to a method of leaching arsenic-containing fumes through sulfuric acid solution, adding pyrite, pressurizing oxidation, synthesizing ferric arsenate and elemental sulfur, and consolidating them. Background technique [0002] Arsenic is a relatively scattered mineral resource. There are few independent deposits, and it mostly coexists with various minerals such as tin, lead, and copper. A large amount of main metals are backlogged in intermediate products, or harmful elements such as arsenic are repeatedly circulated in the smelting process, which affects the technical and economic indicators of smelting. On the other hand, it damages the health of workers and causes arsenic to pollute the environment. [0003] There are two main ways to remove arsenic from arsenic-containing fumes produced in the smelting process of nonferrous metals: producing arsenic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/02C01B17/04
Inventor 王炜崔建明
Owner 红河砷业有限责任公司
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